Fan-oscillating device



F. M. LANDRUM. FAN OSCILLATING DEVOCI E.

APPLICATION FILED DEC. 8, 1918.

Patented Ma1zl6, 1920.

51mm {fly/1 7W.

FRANK M. LANDRUM, or DALLAS, 'rnxns.

FAN-OSCILLATING DEVICE.

Specification of Letters Patent. Patented M31, 16, 1920.

Application filed December 18,1918. Serial 110.267.233.

To all whom it may concern;

Be it known that I, FRANK M. LANDRUM, a citizen of the United States, residing at Dallas, in the county of Dallas and State of Texas, have invented certain new and useful Improvements in Fan-Oscillating Devices of which the following is a specification.

This invention relates to new and useful improvements in oscillating fan devices.

In the oscillating fans now in common use the wires supplying" current to the motor extend from the base of the fan to the center of the motor and as the base is fixed and the motor oscillates, the wires are sooner or later twisted to the breaking point. Frequently the break occurs near the motor making a repair diflicult and often impos sible. In gear driven oscillating fans the gears are driven by the motor and often the gears hang with the result that the motor is burnt out.

I have designed and produced an oscillating device obviating the use of gears or deflectors as well as avoiding twisting of the wires and giving a positive oscillation which operates under all conditions.

In carrying out the invention an oscillating platform is provided with a fan table eccentrically pivoted on the platform. A fan is secured on the table. A resilient ele ment is fastened to the table and has its opposite portion attached to a fixed point. The fan causes a reaction by its outwardly directed air current which results in a backward oscillation. The resilient element exerts a certain tension on the table; whereby the table is oscillated in the same direction as the platform and reversed by the limiting operation of the flexible connection.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings, in which an example of the invention is illustrated and wherein:

Figure 1 is a view of a device constructed in accordance with this invention, parts being illustrated in side elevation and parts in section.

Fig. 2 is a plan view of the same, and

Fig. 3 is a detail of the connection between the table and the resilient element.

In the drawings the numeral 1 designates a base on which a. circular platform 2 is centrally pivoted. From the periphery of the platform a radial arm 3 extends and on the outer end of the arm a circular table 4:

One side of the table overhangs the platform, while the opposite side projects outward from the arm. In order to balance the platform and compensate for the eccentric load imposed by the fan a counter-balancing weight 7 is diametrically disposed under the platform. A stud 8 from the weight extends up through a radial slot 9 in the platform and receives a wing nut 10. The weight may be thus moved away from or toward the center of the platform to com pensate for fans of different weights.

The base 1 is made heavy enough to hold the parts in position and is mounted in a casing 11 which is merged and curved into a vertical column 12 having its front side open. A cap 13 closes the upper end of the column and an adjusting or tensioning screw 4; is threaded therein. The lower end of the screw engages the upper end of an elongated coiled spring 15 which depends through a collar 16 fastened in the column. The column is ofi-set from the table and the coiled spring is swung in a gradual curve from the collar to the table. The spring has a rectangular eye 17 engaging on an angular stud 18 depending from the table. The eye is fastened on the stud by a nut 19. By this arrangement the table is swung by the lateral displacement of the lower end of the spring. The spring employed is of that type in which the coils contact and is known as a non-compression or extension spring.

It will be seen that when the table is swung or oscillated to the limit of its move ment the spring is swung laterally and stretched between the collar and the stud 18, thus causing a reverse movement of the table and platform. As the stud approaches the center of the oscillating movement the tension on the spring is relieved and as the spring cannot be compressed it buckles and swings the table so that the fan is swung over the central line between the collar and the center of the platform. In Fig. 2 the table and fan are in one of the limiting positions or reversing points and the re action caused by the revolving oi the fan blades Will drive the platform and table backward in the direction of the arrows. As the stud 18 reaches the central position of the oscillation the spring is buckled to the point that it throws said stud past the center, thus swinging the table and the fan.

he reversing movement is again carried out at the other end of the oscillation.

The fan cannot stop With the table on eenter so that the device will begin to oscillate When the fan is started. The tension of spring can be regulated by adjusting the screw i l and also the amplitude of the oscillation may beyaried by the same adjustment through the length of the portion of the spring which extends below the ring 16. If the length of this portlon of the sprmgis shortened the rewersing point Will be advanced and the oscillating movement shortened. The eleetrlc cord 20 contalnlng the Wires supplying current to the fan is supported in a yoke 21 mounted on an arched bracket 22 fastened on the cap 13, so that said cord is free and is not twisted to a breaking point and may be readily removed when the fan is detached from the table.

Vhat I claim, is: V

In an oscillating fan, a base, an oscillating member pivoted on the base, an oscillating table eccentrically pivoted on the men'lber, and a coiled springhaving one end attached to the table and the other end I In testimony whereof I afliX my signature.

FRANK M. LANDRUM. 

